<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
  </head>
  <body>
    <script>
    const arr = [2,6,18,15,40]
    let num = 0
    for (let i = 0;i<arr.length;i++){
      if(arr[i]% 3===0&&arr[i]%2 ===0){
        num++
      }
    }
    document.write(`能被3整除的偶数和个数为${num}`)
  </script>
</body>
</html>